Method of producing a cooking vessel comprising an interior surface of partially coated stainless steel
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Solution Overview
Problem
Existing cooking vessels with partially coated stainless steel surfaces face difficulties in achieving both ease of cleaning and durability, especially when used with hard metal utensils, due to challenges in the adhesion and distribution of non-stick coatings.
Innovation Solution
A cooking vessel with a texturized interior surface featuring ribs that extend above valleys, where the non-stick coating covers the side surfaces of the ribs from the bottom surfaces up to the top surfaces without exceeding their height, and the bottom and side surfaces have a roughened surface for improved adhesion, combined with a method involving hot stamping, sanding, and brushing to apply the coating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a non-stick coating is applied to the entire interior surface including rib tops, then ease of cleaning is improved, but the coating durability deteriorates due to mechanical damage from metal utensils
Solution Approach 1:
The interior surface is divided into zones with different properties: rib top surfaces remain uncoated to provide mechanical resistance, while valley bottom and side surfaces are coated for ease of cleaning. This local differentiation allows each area to perform its specific function optimally without compromising the other.
2Reliability
If the non-stick coating is applied only to valley bottoms, then coating durability is improved, but ease of cleaning deteriorates due to coated rib lateral surfaces
Solution Approach 1:
The coating is selectively applied to specific zones: valley bottom surfaces and rib lateral surfaces are coated for ease of cleaning, while rib top surfaces remain uncoated for durability. The roughened surface treatment on coated areas enhances coating adhesion while maintaining the desired cleaning properties.
3Ease of operation
If the non-stick coating extends high up the rib side surfaces, then ease of cleaning is improved, but the adhesion of the coating deteriorates
Solution Approach 1:
The surface roughness parameter is modified on the rib lateral surfaces to enhance coating adhesion. By creating a roughened surface texture on the coated areas, the coating can maintain strong adhesion even when extending up the rib side surfaces, resolving the conflict between coverage area and adhesion strength.
4Reliability
If the rib lateral surfaces are left uncoated, then coating adhesion is improved, but ease of cleaning deteriorates
Solution Approach 1:
The rib lateral surfaces are selectively coated with non-stick material and treated with a roughened surface to provide both good adhesion and ease of cleaning properties, while rib top surfaces remain uncoated for mechanical durability.
5Reliability
If a complex multi-step coating process is used to achieve selective coating, then coating adhesion and durability are improved, but manufacturing complexity increases
Solution Approach 1:
The rib structure is formed first through stamping or drawing, creating the geometric pattern of ribs and valleys. This preliminary structuring enables subsequent coating processes to naturally achieve selective coverage based on the three-dimensional geometry, simplifying the overall manufacturing process while maintaining coating durability.
Solution Approach 2:
Surface roughness is introduced as a key parameter to enhance coating adhesion on rib lateral surfaces. This physical modification of the surface parameter allows for improved coating performance without requiring complex multi-step coating procedures.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enhances the adhesion and durability of the non-stick coating, improving ease of cleaning and mechanical resistance while allowing for the use of metal utensils without damaging the coating, and simplifies the production process.
Implementation Method 1
the bottom surfaces of the valleys and the side surfaces of the ribs have a roughened surface underneath the non-stick coating, to promote adhesion of the non-stick coating
Data Source
AI summary
Provided is a method of producing a cooking vessel, including the following steps:forming a blank from a sheet of stainless steel; drawing of the blank to form a cap comprising an interior surface and an exterior surface, the interior surface comprising a flat base area surrounded by a side wall; hot stamping of a diffuser base onto the exterior surface of the cap; engraving of a grid pattern over at least one portion of the base area of the interior surface of the cap to form a network of ribs having top surfaces that extend above the valleys and side surfaces that are distinct from the bottom surfaces of the valleys, said side surfaces of the ribs connecting the top surfaces of the ribs to the bottom surfaces of the valleys, the side surfaces of the ribs forming ramps connecting the top surfaces of the ribs to the bottom surfaces of the valley; sanding of at least the engraved base area of the interior surface of the cap, to create roughness; applying a non-stick coating on at least the sanded, engraved base area; and brushing and/or polishing of at least the sanded, engraved and coated base area to reveal the stainless steel on the top surfaces of the ribs.